Bugger - Brake caliper seizure

[jonny bravo]

Been riding through thick fog, ice and heavy rain for months. Now the sun comes out and one of my bluespots has seized big time, so much so, the brake disk looks like a dinner plate.

Dropped it into the garage and hopefully might not need anything major, but just in case the disk is fubar'd I have a couple of quick technical questions while they strip it all down: From memory, bluespots bolt straight onto an '89 exup, so odds are it's the standard disks should I need to replace:

Question is, if I have to replace them, keep the disks standard, or is there anything better out there?